package com.india.framework.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.alibaba.druid.spring.boot.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;
import com.india.common.utils.spring.SpringUtils;
import com.india.framework.aspectj.lang.enums.DataSourceType;
import com.india.framework.config.propterties.DruidProperties;
import com.india.framework.datasource.DynamicDataSource;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.servlet.*;
import javax.sql.DataSource;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {

        @Bean
        @ConfigurationProperties("spring.datasource.druid.master")
        public DataSource masterDataSource(DruidProperties druidProperties)
        {
            DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
            return druidProperties.dataSource(dataSource);
        }

        @Bean
        @ConfigurationProperties("spring.datasource.druid.slave")
        @ConditionalOnProperty(prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
        public DataSource slaveDataSource(DruidProperties druidProperties)
        {
            DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
            return druidProperties.dataSource(dataSource);
        }

        @Bean(name = "dynamicDataSource")
        @Primary
        public DynamicDataSource dataSource(DataSource masterDataSource)
        {
            Map<Object, Object> targetDataSources = new HashMap<>();
            targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
            setDataSource(targetDataSources, DataSourceType.SLAVE.name(), "slaveDataSource");
            return new DynamicDataSource(masterDataSource, targetDataSources);
        }

        /**
         * 设置数据源
         *
         * @param targetDataSources 备选数据源集合
         * @param sourceName 数据源名称
         * @param beanName bean名称
         */
        public void setDataSource(Map<Object, Object> targetDataSources, String sourceName, String beanName)
        {
            try
            {
                DataSource dataSource = SpringUtils.getBean(beanName);
                targetDataSources.put(sourceName, dataSource);
            }
            catch (Exception e)
            {
            }
        }

        /**
         * 去除监控页面底部的广告
         */
        @SuppressWarnings({ "rawtypes", "unchecked" })
        @Bean
        @ConditionalOnProperty(name = "spring.datasource.druid.statViewServlet.enabled", havingValue = "true")
        public FilterRegistrationBean removeDruidFilterRegistrationBean(DruidStatProperties properties)
        {
            // 获取web监控页面的参数
            DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
            // 提取common.js的配置路径
            String pattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
            String commonJsPattern = pattern.replaceAll("\\*", "js/common.js");
            final String filePath = "support/http/resources/js/common.js";
            // 创建filter进行过滤
            Filter filter = new Filter()
            {
                @Override
                public void init(javax.servlet.FilterConfig filterConfig) throws ServletException
                {
                }
                @Override
                public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                        throws IOException, ServletException
                {
                    chain.doFilter(request, response);
                    // 重置缓冲区，响应头不会被重置
                    response.resetBuffer();
                    // 获取common.js
                    String text = Utils.readFromResource(filePath);
                    // 正则替换banner, 除去底部的广告信息
                    text = text.replaceAll("<a.*?banner\"></a><br/>", "");
                    text = text.replaceAll("powered.*?shrek.wang</a>", "");
                    response.getWriter().write(text);
                }
                @Override
                public void destroy()
                {
                }
            };
            FilterRegistrationBean registrationBean = new FilterRegistrationBean();
            registrationBean.setFilter(filter);
            registrationBean.addUrlPatterns(commonJsPattern);
            return registrationBean;
        }

}
